SELF-FERTILIZATION.— It is an astonishing fact that self-fertilization should not have been an habitual occurrence. It apparently demonstrates to us that there must be something injurious in the process. Nature thus tells us, in the most emphatic manner, that she abhors perpetual self-fertilization.
—Darwin's Fertilization of Orchids.1

MR. DARWIN has announced a new work, entitled "Domesticated Animals and Cultivated Plants, or the Principles of Variation, Inheritance, Reunion, Crossing, Interbreeding, and Selection under Domestication."